1. After signing in to your teacher account, click the "Science" or "Social Studies" link from the left sidebar.
  2. Click the "Science" or "Social Studies" button.
  3. Click the "Assignments" tab.
  4. Select the trashcan icon in the leftmost column for the skill that you want to delete.
  5. Click "OK."

The skill will now be deleted for all students to who it had been assigned.